微米级二氧化硅颗粒的滚动、滑动和扭转--实验、数值和理论分析
Rolling, sliding & torsion of micron-sized silica particles - Experimental, numerical and theoretical analysis
摘要：
使用nanoindenter设置，允许正常和横向位移控制和测量各自的力的个别，非常小的颗粒与其他颗粒和壁的接触力学进行了研究。使用硼硅酸盐微球测试滑动、滚动和扭转力和扭矩，其特征在于半径约为10 $μ$ m。接触是与不同粗糙度的平面硅基板的纯滑动和滚动，并与硅基，离子束制作的轨道系统的组合滚动和扭转。实验结果进行了讨论，并比较各种分析预测和接触模型，允许两个并发的解释的表面粗糙度，塑性和粘附力的影响。这使我们能够确定滚动和扭转摩擦系数以及它们相关的长度尺度。有趣的是，即使正常接触表现为弹性（赫兹），所有其他模式的运动显示效果，由于表面粗糙度和随之而来的塑性形变。粘附的影响被解释在不同的模型的框架中，并且对于不同的自由度是非常不同的，对于滚动是最大的。
英文摘要：
The contact mechanics of individual, very small particles with other particles and walls is studied using a nanoindenter setup that allows normal and lateral displacement control and measurement of the respective forces. The sliding, rolling and torsional forces and torques are tested with borosilicate microspheres, featuring radii of about 10$μ$m. The contacts are with flat silicon substrates of different roughness for pure sliding and rolling and with silicon based, ion-beam crafted rail systems for combined rolling and torsion. The experimental results are discussed and compared to various analytical predictions and contact models, allowing for two concurrent interpretations of the effects of surface roughness, plasticity and adhesion. This enables us to determine both rolling and torsion friction coefficients together with their associated length scales. Interestingly, even though normal contacts behave elastically (Hertzian), all other modes of motion display effects due to surface roughness and consequent plastic deformation. The influence of adhesion is interpreted in the framework of different models and is very different for different degrees of freedom, being largest for rolling.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
